Kinked demand curve

A kinked demand curve occurs when the demand curve is not a straight line but has a different elasticity for higher and lower prices.

One example of a kinked demand curve is the model for an oligopoly. This model of oligopoly suggests that prices are rigid and that firms will face different effects for both increasing price or decreasing price. The kink in the demand curve occurs because rival firms will behave differently to price cuts and price increases.

Diagram of kinked demand curve

kinked-demand-curveThe logic of the kinked demand curve is based on

  • A few firms dominate the industry
  • Firms wish to maximise profits

Impact of price rise

  • If a firm increases the price, then it becomes more expensive than rivals and therefore, consumers will switch to its rivals.
  • Therefore for a price rise, there is likely to be a significant fall in demand. Demand is, therefore, price elastic.
  • In this case, of increasing price firms will lose revenue because the percentage fall in demand is greater than the percentage rise in price.

Impact of price cut

  • If a firm cut its price, it is likely to lead to a different effect. In the short term, if a firm cuts price it would cause a big increase in demand and therefore would lead to a rise in revenue. The firm would gain market share.
  • However, other firms will not want to see this fall in market share and so they will respond by also cutting price to follow the first firm. The net effect is that if all firms cut price – the individual firm will only see a small increase in demand.
  • Because there is a ‘price war’ demand for a firm is price inelastic – there is a smaller percentage rise in demand.
  • If demand is inelastic and price falls, then revenue will fall.

Prices stable

  • If the kinked demand curve is true, the firm has no incentive to raise price or to cut price.

Example of a kinked demand curve in practice

  • One possibility is the market for petrol. It is homogenous and consumers are price sensitive.
  • If one petrol station increased the price there would be a shift to other petrol stations.
  • However, if one petrol station cuts price, other firms may feel obliged to follow suit and also cut price – therefore a price cut would be self-defeating for the first firm.

How realistic is the kinked demand curve in practice?

  • In many oligopolies, firms may have a degree of brand differentiation. Mobile phone companies can increase the price but consumers are willing to pay because the price is not the dominant factor. Some petrol stations may increase price and not see elastic demand because they have the best location.
  • Firms may not want to defend market share. Rather than getting pulled into a price war, some firms may not respond to price cut but concentrate on non-price competition to retain an advantage.

Other examples of the kinked demand curve

It is not just in an oligopoly where there is potential kinked demand curve.

  • In the market for an addictive drug like cocaine. If the price is cut, it may encourage first-time users to try. However, once addicted, if the price rises, then demand will be price inelastic (they will be willing to pay the higher price to get their drug fix)

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